| 摘要 |
<p>A high voltage power supply for an electrostatic precipitator comprises a high voltage transformer, a high voltage bridge rectifier and a semiconductor switch controller configured to control an output power level of the high voltage power supply. A control unit (50) is configured to determine a firing angle of firing pulses for the semiconductor switch controller. During normal operation, a peak voltage value is measured and stored in each half period. When a breakdown is detect ed, a residual voltage (U r ) over the electrostatic precipitator is measured. A firing angle (α 1 ) of a firing pulse to be provided to said semiconductor switch controller in the first half period after the breakdown is determined from the latest stored measured peak voltage value (U bef ) and the measured residual voltage (U r ) based on a predetermined relationship between the firing angle (α 1 ) and said measured voltages.</p> |
